<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <title>Document</title>
    <style>
      a:link {
        /*这里的link可以省略*/
        color: aqua;
      }

      a:visited {
        color: red;
      }

      a:hover {
        color: bisque;
      }

      a:active {
        color: blue;
      }
      
      input:focus {
        outline: 7px solid red;
        /*外轮廓线*/
      }

      ul li:first-child {
        color: aqua;
      }

      ul li:last-child {
        color: antiquewhite;
      }

      ul li:nth-child(2) {
        color: pink;
      }
    </style>
  </head>

  <body>
    <a href="https://www.baidu.com/" target="_blank" title="百度">单击我跳转</a>
    <form action="">
      <input type="text" />
    </form>

    <ul>
      <li>aa01</li>
      <li>aa02</li>
      <li>aa03</li>
      <li>aa04</li>
    </ul>
    <p>hhhhhhhh</p>
  </body>
</html>
